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After the takedown pin is out of the way, slide the upper receiver forward. You will notice that the charging handle will get caught on a small nub on the top of the gearbox. Simply pull the charging handle back slightly and lift it over the nub.

Continue to pull the upper receiver forward until the two halves separate. Do not yank on the wires too hard if they get stuck, just gently guide them out.

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Using a 2mm hex driver, remove the two small screws that hold the pistol grip plate in place.

After removing the plate, you will see the motor and two wires attached to it. Carefully lift the wires up off of the motor terminals. Note the orientation of the motor and the wires, you will need to re-install them the same way later on.

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Using a #1 Phillips screwdriver, remove the two screws holding the pistol grip to the gearbox. Note that there are four holes in the pistol grip and gearbox, but only two of them will have screws. The screws will be arranged diagonally from one another, and can be re-installed in either diagonal configuration.

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Punch out the small receiver pin from right to left, as shown. It is important that you do it in this direction because the pin is installed at the factory from left to right, and has a knurled surface on one end to help hold it in place.

Punch out the rear takedown pin. Unlike the front takedown pin, this one will completely separate from the receiver.

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You can disassemble the inner barrel and hop-up unit by adjusting the hop-up to its lowest setting (turn the knob counterclockwise until it stops), removing the small green clip on the underside of the hop-up unit, then pulling the barrel out. You can also remove the hop-up bucking as well as a small brass ring that helps support the barrel.

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Remove the right half of the gearbox while holding the cylinder and spring guide down. If you fired a single shot on semi-auto beforehand, the piston should be fully forward. If not, it may be half-cocked, increasing spring tension and possibly causing the gears to pop out when you open the gearbox.

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Remove the cylinder, piston, tappet plate, and air nozzle assembly by lifting it up. Be careful not to lose the tappet plate spring when you do this.

Note that each gear may have one or more shims on them. Keep each shim in its original position and be careful not to mix up or lose any while removing the gears. Each gearbox has a unique shim configuration.

After the gears are out of the way, carefully pick up the anti-reversal latch and do not lose the small spring that is attached to it.

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Flip the gearbox over and you will see the selector plate. In order to remove this, you will first need to get a very small spring out of the way. This can be accomplished with a pick tool, and should be done very carefully to avoid losing the spring.

After the spring is removed, slide the selector plate forward, and pry it out starting with the bottom right edge, as shown.

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The gearbox should now be fully disassembled with the exception of the safety lever and the cutoff lever. These are each held in place by one screw and can be removed easily, but there is usually no need to do so.